Feat(ci): Introduce posting changelog into the Slack channel

[literat]

Description

Additional context

https://github.com/kiwicom/orbit/blob/master/.github/workflows/publish.yml#L74

Issue reference

#1781

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[coveralls]

coverage: 79.469%. remained the same
when pulling 3c424ba on chore/post-changelog-slack
into 44eb2e1 on main.

[literat]

[adamkudrna]

So many dependencies… Did you consider making a GH action? 🤔

[adamkudrna]

Ideas

• Can we get rid of the package name in individual list items?

• To reduce visual clutter, I'd consider:

  • merging the two lines with "new release" and package name into one,
  • maybe removing the date since it's part of the message meta data,
  • for example:

  **🚀 New `@lmc-eu/spirit-web` package release [3.1.0][#]**

[literat]

Yeah, I think can do many things. Primarily, this should help us with fabricating release notes. I know that just copy&paste will not be enough but it can save a lot of time. So let's modify this to our liking. :-)

[literat]

So many dependencies… Did you consider making a GH action? 🤔

No, this is just a "make it work" part. Right now, I have checked out a few GHA (https://github.com/vaultinum/changelog-to-slack-action), but no one has offered us to change the formatting and other things. Maybe creating a simple package in our monorepo for this and moving the dependencies there will help reduce the clutter.